Study of Green Coconut Shell Biosorbent for Dye Removal Preparation and its Applications

To study the possibility of using coconut shells to remove of popular in the textile industry dyes from aqueous solutions. The sorption abilities of an unconventional sorbent were tested against four anionic dyes: Reactive Black , Reactive Yellow , Acid Yellow , Acid Red as well as two cationic dyes: Basic Violet and Basic Red. The scope of research included to investigate the effect of pH on the effectiveness of sorption of dyes, to determine the time of equilibrium of sorption and to determine the maximum sorption capacity of coconut shells with respect to pigments. The most favorable pH of sorption for the anionic dyes and Basic Violet was pH 3 and for Basic Red 46 - pH 6. The equilibrium time of sorption was the shortest in the case of acidic dyes , while the longest in the case of alkaline dyes.